<template>
  <div>
    <div id="box" ref="mybox">
      DEMO
    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {

      }
    },
    mounted() {
      this.init()
    },
    methods: {
      init() {
        const self = this
        this.$refs.mybox.style.color = 'red'
        setTimeout(() => {
          self.$refs.mybox.style.color = 'blue'
        }, 2000)
      }
    }

  }
</script>

<style scoped>
  #box {
    width: 100px;
    height: 100px;
    line-height: 100px;
    font-size: 20px;
    text-align: center;
    border: 1px solid black;
    margin: 50px;
    color: yellow;
  }
</style>
